Improvement in kilns for making artificial stone



2 Sheets- Sheeti D. M.S'PROGLE.

Kilns for Making Artificial Stone.

Pate nt d Dec. 3,1872.

v k w w J 7 o 70 0 iiiiilii m c i J a a v 6\ 7 r mi i 4 A m.

DANIEL M. SPROGLE, OF ANNAPOLIS, MARYLAND.

IMPROVEMENT IN KILNS FOR MAKING ARTIFICIAL STONE.

Specification forming part of Letters Patent No. 133,547, dated December 3, 1872.

To all whom it may concern:

Be it known that I, DANIEL M. SPROGLE, of Annapolis, in the county of Anne Arundel and State of Maryland, have invented a new and Improved Kiln to be used in the Mannfacture of Stone Artificially; and I do hereby declare that thefollowin g is a full, clear, and exact description thereof, reference being had to the accompanying drawing making part of this specification, in which-.

Figure 1, Plate 1, is a perspective view of the kiln complete. Fig. 2, Plate 1, is a section taken vertically and transversely through the same. Fig. 3, Plate 2, is a section taken vertically and longitudinally through the kiln and Fig. 4, Plate 2, is a section taken horizontally through the kiln.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to an improvement on the construction of kilns or buildings which a are designed for inclosing material during its conversion into artificial stone by a carbonating process.

Kilns which I have hitherto used were constructed with fiat tops or roofs, and it was found that the moisture which accumulated on the inner sides thereof would form into drops and fall upon the stone, thus spotting and discolorin g it. To prevent this is the object of my invention.

The following description of my invention will enable others skilled in the art to understand it.

In the accompanying drawing, A A represent four horizontal beams which are grooved and secured together so as to form a quadrilateral frame which has for its bottom the flooringboards a. The grooves of thisframe receive into them upright side and end pieces I), which are lapped together so as to form tight joints. B represents a frame of the same size as frame A, which is grooved in its lower edge for receiving the upper edges of the side and end boards b, as shown in the drawing, Figs. 1, 2, and 3. The longitudinal beams of the frame B have gutters s 8 formed into their upper surfaces, outside of which gutters inclined abutments r rare formed, as shown in Figs. 1 and 2. The cross-beams of the frame B are grooved on their upper sides and have erected on them the gable-ends c c of the roof. The roof is composed of inclined boards 0 c, which are supported against the abutments r r and lapped together at their sides. The battens d strengthen the boards 0, while the battens d d not only strengthen the boards 0 a, but also form lapped joints at the meeting of these boards. Upon the floor a of the kiln a false floor is laid, which consists of a bridge-piece, O, on which the material to be hardened is arranged and beneath which is a heating-coil, 9. Either steam or hot air may be used for drying the material In Fig. 1 n represents a hole into which a pipe is received for the introduction into the kiln of carbonated vapor.

It will be seen from the above description that by lifting off the frame B and removing the side and end boards b, the floor G will be exposed, when the material to be treated can be conveniently piled thereupon, after which the side and end boards and the frame B are put in their places, thus, inclosing the material therein.

The material when put into the kiln is in a green or moist condition, owing to the water used to mix it, consequently it is necessary to get rid of a considerable amount of this water before introducing carbonic-acid gas into the 'kiln. This is done by introducing steam into the pipe-coil g, or, if desired, hot air may be employed alone, or in combination with the steam-heater. As the moisture is thus expelled from the material it will rise to the roof 0, and that which does not accumulate thereon will escape from the kiln through a pipe, 17. (See Fig. 1.) The watery particles which accumulate on the roof 0 will run together and form drops, which, owing to the inclination of this roof, will trickle down and be received into the inside gutters s, and thence flow out of the kiln.

If desirable, a roof having'only one inclined plane may be used instead of the doublepitched roof shown, and the inner side of the roof may be channeled or corrugated so as to increase the condensing-surface.

In this way and by these means I eifectual- 1y prevent discoloration of the stone, whatever in inside gutters s, substantially as and for may be the amount of water expelled therethe purpose described; from While in the kiln. DANIEL M. SPROGLE.

Having described my invention, what I claim as new, and desire to secure by Letters Witnesses: Patent, is- A. S. JOHNSON,

Aki1n,ha-ving an inclined roof terminating SAMUEL 0001mm. 

